BENDIX AD-9si User Manual

8
PREVENTIVE MAINTENANCE
Important: Review the warranty policy before performing
any intrusive maintenance procedures. An extended
warranty may be voided if intrusive maintenance is
performed during this period. Purge valve and governor
maintenance is permissible during the warranty period
only when using a genuine Bendix
®
AD-9si
®
purge valve
kit or governor kit.
Because no two vehicles operate under identical
conditions, maintenance and maintenance intervals will
vary. Experience is a valuable guide in determining the
best maintenance interval for any one particular operation.
RESERVOIR DRAINING
Per the guidelines shown in Table 2, check for moisture in
the air brake system by opening reservoir drain valves and
checking for the presence of water. If moisture is present,
the desiccant cartridge may require replacement; however,
the following conditions can also cause water accumulation
and should be considered before replacing the desiccant:
1. An outside air source has been used to charge the
system. This air did not pass through the drying bed.
2. Air usage is exceptionally high and not normal for a
highway vehicle.
This may be due to accessory air demands or some
unusual air requirement that does not allow the
compressor to load and unload (compressing and
non-compressing cycle) in a normal fashion. Check
for high air system leakage. If the vehicle vocation
has changed, it may be necessary to upgrade the
compressor size. Refer to Bendix Specification
BW-100-A / Appendix D, to determine if any changes
are necessary. Specication BW-100-A is available
from the Bendix TechTeam at 1-800-247-2725 or
bendix.com.
3. The location of the air dryer and reservoir system
is too close to the air compressor. Refer to Bendix
Specication BW-110-A / Appendix B, for discharge line
lengths.
4. In areas where more than a 30 degree range of
temperature occurs in one day, small amounts of water
can temporarily accumulate in the air brake system due
to condensation. Under these conditions, the presence
of small amounts of moisture is normal.
CARTRIDGE REPLACEMENT
Adhering to a preventive maintenance schedule is crucial to
keeping a vehicle’s air system clean and ensuring superior
performance of all components that utilize system air – such
as brakes, emissions equipment, and automated manual
transmissions. See Table 2 for Bendix AD-9si air dryer
recommended cartridge replacement intervals for vehicles
equipped with a Bendix
®
compressor.
More frequent intervals may be required depending
on a vehicle’s age, its compressor condition, use of a
non-Bendix compressor, the operating environment,
the vehicle’s vocation, and its usage. In conjunction
with these guidelines, fleets can determine the
functionality of their lters by checking for moisture in
the air brake system monthly. If moisture is present,
the air dryer cartridge may require replacement.
Figure 6 – Heater and Thermostat Connector
Heater & Thermostat
Connector
Table 2 – Service Intervals
Recommended Service Intervals for Bendix
®
Air Dryers
Air
Usage
Typical Vehicle
Vocation Axles
Reservoir Drain Interval
(whichever comes first)
Bendix
®
Standard
Cartridge
Replacement
PuraGuard
®
Oil Coalescing
Cartridge Replacement*
Bendix
®
GC
™
Green Cartridge
ReplacementHours Mileage Time AD-9
®
AD-9si
®
AD-IP
®
AD-IS
®
AD-SP
®
Standard
Line haul, city,
delivery
5 or less 900 25,000 3 months 24 months 24 months or 200,000 miles 12 months
Medium
Double trailers,
light transit, light
off-highway
8 or less 450 12,000 2 months 18 months 18 months or 150,000 miles 12 months
High
Multiple trailers,
city transit, heavy
duty off-road
11 or
less
300 6,000 1 month 12 months 12 months 6 months
*Always follow the truck manufacturer's published service recommendations as they may require more frequent services.

BENDIX AD-9si Specifications

General

Brand	BENDIX
Model	AD-9si
Category	Dehumidifier
Language	English